Teresa is the Spanish form of Theresa — of disputed origin, possibly from the Greek therizein (to harvest) or from the small Greek island of Therasia near Santorini.
Teresa has been continuously in the U.S. top 500 for over a century. Today it sits in the U.S.
Teresa does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
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In Pythagorean numerology the letters of Teresa reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.